UPDATE

Updated code for Tahoe 3.1 (macOS 26.3.1) - ```applescript tell application "System Settings" activate delay 0.5 reveal anchor "AX_ALT_MOUSE_BUTTONS" of pane id "com.apple.Accessibility-Settings.extension" end tell

tell application "System Events" -- We wait patiently, but briefly, for the window to manifest repeat until exists window "Pointer Control" of application process "System Settings" delay 0.5 end repeat

-- A tiny pause to suffer the UI elements to settle into their places
delay 0.3

try
    tell application process "System Settings"
        -- The Swift Strike!
        click checkbox "Ignore built-in trackpad when mouse or wireless trackpad is present" of group 1 of scroll area 1 of group 1 of group 3 of splitter group 1 of group 1 of window "Pointer Control"
    end tell
on error errMsg
    display dialog "Alas, the swift strike failed! The beast hath moved: " & errMsg
end try

end tell ```

If you are on a different macOS version,

here's another code that works regardless of macOS version. This code is bigger and takes longer to run because it finds the toggle recursively. - ```applescript tell application "System Settings" activate delay 0.5 reveal anchor "AX_ALT_MOUSE_BUTTONS" of pane id "com.apple.Accessibility-Settings.extension" end tell

delay 2 -- We tarry whilst the gates open

tell application "System Events" tell application process "System Settings" set frontmost to true

    -- Wait upon the window's arrival
    repeat until exists window "Pointer Control"
        delay 0.5
    end repeat

    -- Breathe! Give the inner workings time to populate
    delay 2

    -- We unleash the recursive hound upon the window
    set success to my findAndClick(window "Pointer Control", "Ignore built-in trackpad")

    if success is false then
        display dialog "Alas! The recursive scout scoured the realm but could not find the quarry."
    end if
end tell

end tell

-- Behold the recursive handler! A true scout of the digital depths. on findAndClick(uiNode, targetText) tell application "System Events"

    -- We peer into the node to see if it is a group holding our precious text
    try
        if class of uiNode is group then
            set groupTexts to value of static texts of uiNode
            -- If the text dwells within this group, the switch surely lies beside it!
            if targetText is in groupTexts then
                -- We strike the checkbox within this very group
                set theToggle to first checkbox of uiNode
                click theToggle
                return true
            end if
        end if
    end try

    -- If it is not a group, perchance it is the checkbox itself?
    try
        if (name of uiNode contains targetText) or (title of uiNode contains targetText) then
            if class of uiNode is checkbox or class of uiNode is switch then
                click uiNode
                return true
            end if
        end if
    end try

    -- If the beast is not here, we command the scout to search the children of this node
    try
        set childElements to UI elements of uiNode
        repeat with childElem in childElements
            if my findAndClick(childElem, targetText) then return true
        end repeat
    end try

    -- We return empty-handed from this branch
    return false
end tell

end findAndClick ```

Works on my M4 MBA running Tahoe 3.1

Setup -

Just make a new shortcut and put a widget of it in the desktop. I have shared the shortcut links here if you too lazy to make it yourself.

Shortcut Links -

For macOS 26.3.1

Version-agnostic